LATE eFILING ITR-1

I have submitted paper ITR-1 upto AY 2010-11 at income tax A.O. office timely . For AY 2011-12 and AY 2012-13 my taxable income was below 5 lac and I could not submit Paper ITR-1 due to exemption from submission of ITR upto taxable income 5 lac.